package yqlib import ( "container/list" "fmt" yaml "gopkg.in/yaml.v3" ) func lengthOperator(d *dataTreeNavigator, matchMap *list.List, expressionNode *ExpressionNode) (*list.List, error) { log.Debugf("-- lengthOperation") var results = list.New() for el := matchMap.Front(); el != nil; el = el.Next() { candidate := el.Value.(*CandidateNode) targetNode := unwrapDoc(candidate.Node) var length int switch targetNode.Kind { case yaml.ScalarNode: length = len(targetNode.Value) case yaml.MappingNode: length = len(targetNode.Content) / 2 case yaml.SequenceNode: length = len(targetNode.Content) default: length = 0 } node := &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", length), Tag: "!!int"} result := candidate.CreateChild(nil, node) results.PushBack(result) } return results, nil }